name: Continuous Delivery
on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

env:
  IMAGE_NAME: ${{ github.repository }}
  REGISTRY: ghcr.io

jobs:
  build-maven:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - name: Set up JDK 11
      uses: actions/setup-java@v3
      with:
        java-version: '11'
        distribution: 'temurin'
    - name: Build with Maven
      working-directory: .
      run: mvn -B package 

  build-docker:
    runs-on: ubuntu-latest
    env:
      IMAGE_NAME: ${{ github.repository }}
      REGISTRY: ghcr.io
    strategy:
      fail-fast: false
      matrix:
        include:
          - alias: jre-11
            dockerfile: packaging/docker/unix/eclipse-temurin-11-jre/Dockerfile
            tags: test
          - alias: jre-11-alpine
            dockerfile: packaging/docker/unix/eclipse-temurin-11-jre-alpine/Dockerfile
            tags: test-alpine
    name: "Build Docker image: ${{ matrix.alias }}"

    steps:
    - uses: actions/checkout@v2
    
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v1.5.0
    
    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v3.3.0
      with:
        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
    
    - name: Build Docker image
      uses: docker/build-push-action@v2.6.1
      with:
        push: false
        file: ${{ matrix.dockerfile }}
        tags: ${{ matrix.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        
  deploy:
    if: ${{ github.ref == 'refs/heads/main' }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - alias: jre-11
            dockerfile: packaging/docker/unix/eclipse-temurin-11-jre/Dockerfile
            tag-prefix: eclipse-temurin-11-jre-
            tag-latest: true
            extra-tags: ", ghcr.io/${{ github.repository }}:jre-11"
          - alias: jre-11-alpine
            dockerfile: packaging/docker/unix/eclipse-temurin-11-jre-alpine/Dockerfile
            tag-prefix: eclipse-temurin-11-jre-alpine-
            tag-latest: false
            extra-tags: ", ghcr.io/${{ github.repository }}:alpine, ghcr.io/${{ github.repository }}:jre-11-alpine"
    needs:
      - build-maven
      - build-docker
    permissions:
      contents: read
      packages: write
    name: "Deploy Docker Image: ${{ matrix.alias }}"
    
    #TODO: There is slight double build overhead, but we prevent permissions from being exposed too widely
    steps:
    - uses: actions/checkout@v2
    
    - name: Log in to the Container registry
      uses: docker/login-action@v1.10.0
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v1.5.0
    
    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v3.3.0
      with:
        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
        flavor: |
          latest=${{ matrix.tag-latest }}
          prefix=${{ matrix.tag-prefix }}
          suffix=

    - name: Build and Deploy Docker image
      uses: docker/build-push-action@v2.6.1
      with:
        context: .
        file: ${{ matrix.dockerfile }}
        push: true
        tags: ${{ steps.meta.outputs.tags }} ${{ matrix.extra-tags }}
        labels: ${{ steps.meta.outputs.labels }}
